104 lines
2.5 KiB
JavaScript
104 lines
2.5 KiB
JavaScript
// Simple typographic replacements
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//
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// (tm) (TM) → ™
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// +- → ±
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// ... → … (also ?.... → ?.., !.... → !..)
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// ???????? → ???, !!!!! → !!!, `,,` → `,`
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// -- → –, --- → —
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// --> <-- -> <- to → ← → ←
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// (pa) (PA) → ¶
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//
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// Disabled replacements:
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//
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// (c) (C) → ©
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// (r) (R) → ®
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// (p) (P) -> §
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let RARE_RE = /\+-|\.\.|\?\?\?\?|!!!!|,,|--|-->|<--|->|<-/;
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let SCOPED_ABBR_RE = /\((tm|pa)\)/gi;
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let SCOPED_ABBR = {
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pa: "¶",
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tm: "™",
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};
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function replaceFn(match, name) {
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return SCOPED_ABBR[name.toLowerCase()];
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}
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function replaceScoped(inlineTokens) {
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let i, token;
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for (i = inlineTokens.length - 1; i >= 0; i--) {
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token = inlineTokens[i];
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if (token.type === "text") {
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token.content = token.content.replace(SCOPED_ABBR_RE, replaceFn);
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}
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}
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}
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function replaceRare(inlineTokens) {
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let i,
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token,
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inside_autolink = 0;
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for (i = inlineTokens.length - 1; i >= 0; i--) {
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token = inlineTokens[i];
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if (token.type === "text" && !inside_autolink) {
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if (RARE_RE.test(token.content)) {
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token.content = token.content
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.replace(/\+-/g, "±")
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// Custom arrows
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.replace(/(^|\s)-{1,2}>(\s|$)/gm, "\u0020\u2192\u0020")
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.replace(/(^|\s)<-{1,2}(\s|$)/gm, "\u0020\u2190\u0020")
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// .., ..., ....... -> …
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// but ?..... & !..... -> ?.. & !..
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.replace(/\.{2,}/g, "…")
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.replace(/([?!])…/g, "$1..")
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.replace(/([?!]){4,}/g, "$1$1$1")
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.replace(/,{2,}/g, ",")
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// em-dash
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.replace(/(^|[^-])---(?=[^-]|$)/gm, "$1\u2014")
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// en-dash
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.replace(/(^|\s)--(?=\s|$)/gm, "$1\u2013")
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.replace(/(^|[^-\s])--(?=[^-\s]|$)/gm, "$1\u2013");
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}
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}
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if (token.type === "link_open" && token.info === "auto") {
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inside_autolink--;
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}
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if (token.type === "link_close" && token.info === "auto") {
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inside_autolink++;
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}
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}
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}
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function replace(state) {
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let blkIdx;
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for (blkIdx = state.tokens.length - 1; blkIdx >= 0; blkIdx--) {
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if (state.tokens[blkIdx].type !== "inline") {
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continue;
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}
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if (SCOPED_ABBR_RE.test(state.tokens[blkIdx].content)) {
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replaceScoped(state.tokens[blkIdx].children);
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}
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if (RARE_RE.test(state.tokens[blkIdx].content)) {
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replaceRare(state.tokens[blkIdx].children);
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}
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}
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}
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export function setup(helper) {
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helper.registerPlugin((md) => {
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if (md.options.typographer) {
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md.core.ruler.at("replacements", replace);
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}
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});
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}
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